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7 (No Model.)

W. S. BELDING-- ARMATURE FOR DYNAMO ELECTRIC MACHINERY. No. 895,260.Patented Dec. 25, 1888.

wa /dew v ZF7ZU67ZZZI' UNITED STATES PATENT EETCE.

WARREYS. BEIIDIXG, OF CHICAGO, II.I.IX( I ARMATURE FOR DYNAMO-ELECTRICIVIAClHNERY.

SPECIFICATION forming part of Letters Patent No. 395,260, dated December.25, 1888.

Application filed Morel: 22, 1888. Serial No. 268,066. (No model.)

cago, in the county of Cook and State of Illil nois, have inventedcertain new and useful Improvements in Armatures for Electric Motors andDynamos; and I do hereby declare the following to he a full, clear, andexact dei scription of the invention, such as will enahle others skilledin the art to which it appertains to make and use the same, referenceheing' had to the accompanying drawings, and to letters or figures ot'relerence marked thereon, which form a part of this specification.

This invention relates to a hollow cast-iron core for armaturcs forelectric motors and dynamos. I have ascertained that a greateret'tieiency may be attained by the use of a hollow core. By the use ofsuch a core the generation of Foucault currents is reduced and themagnetic effect is concentrated in and near the surface of the core inclose proximity to the field-magnets.

In the accompanying drawings, Figurel is a side elevation of one form inwhich my improved core may he made. Fig. 9 is a side elevation of one ofthe segments of the core shown in lrig'. I. Fig. 3 is a section throughand in the direction of the axis of the armature.

An inspection of Fig. 3 will disclose the fact?- that the core isdivided at right angles to its axis. The parts formed by this divisionare I By thus dividing the core each l lettered A A.

part A is (unless divided transversely, as

hereinafter set. forth) a complete ring open all along one side, and mayhe cast in an ordinary sand mold.

In Fig. 2 onehalti ol. one of the parts A is shown, the open sideheing'd i rect'ed toward the eye. Il'ithout making this d ivision it wouldhe aditti cult. matter to cast the core; hut when the division is made anynumher of patterns" for said parts may he put on a gate and cast in thecommon way.

The core may he said tohc a ring-Form shell divided or cut transverselyto its axis to constitute two parts hol sides. It may he uniform inthickness throughout its circumterence to form a ring lowed at theirmeeting:

of the Grammc type, or it may have the polar extensions A, which may ormay not he hollow. The drawings show them hollow. \\'hen these saidparts A A are placed against each other, the core is completed, and thecoils I) may he wound upon it. When said coilshave hcen applied, t'lu'yhold the parts A A togctlun'.

The ring may now he mounted upon a shall" in any suitahle manneras, forexample, hy means of two spiders, t having their arms secured at thepolcsol the ring. Each of the parts A may also he divided radially intotwo or more parts, forming a segment of the ring. Fig. 2 shows such asegment, the division extending th rough diamet rical ly-o ipositepoles, and Fig. 13 shows th is transverse di vision made in the samemanner. \Vhcu this transverse division is made, two segments ot theparts'A A may he ln'oug'ht together-to complete a segment of the coreand wound. The segment of the entire core may thus he huilt upscparately and afterward united end to end to complete the ring. It willhe understood that these mecting' ends may he nnitcd in several ways. InFig. 1 the arms ot the spidersj,

are hroad enough to extend over said ends, aml two screws, t", passthrough the arms, one into one and the other into the other end or" thesegments. The dotted lines indie-rte the line in which the ends of thesegments meet.

The screws may pass from one spiderarm into the opposite one through theparts A A, thus securing said parts against movement upon each other.This may ol' course he accomplished in other ways.

buitahlc insulation may he intcrposct'l hetwccn the parts A A.

I am aware that it is not new in the art to eonstrtu-t hollow ironarmaturea-ores, and I do not claim,hroadly, all t'ormsol hollow cores.

I claim as my invention 1. A hollow cast-iron armaturc-corc composed ofthe annular parts A A, hollowed at their meeting sides, suhslantially asshown and ('lescrihed.

2. A hollow cast-iron. armature-core composed ot the annular parts A A,hollowed at their meeting sides, said parts hcing divided transverselyinto segments, suhstantially as shown and d escrihcd.

3. The comhination, with ahollow cast-iron armaturc-core composed ot theannular parts A A, hollowed at their meeting sides, of one or morespiders having arms attached to said core, substantially as shown anddescribed.

t. The combination, with ahollow eastiron armature-core composed of theannular parts A A, hollowed at their meeting sides, of two spiders, C C,applied to each side of said core and having their arms secured to thepoles of said core, substantially as shown and described.

5. The combination of a hollow east-iron armature-core composed of theannular parts A A, hollowed at their meeting sides, divided transverselyinto segments, of one or more spiders, C, the meeting ends of saidsegments being secured to the adjacent spider-arms, substantially asshown and described.

(5. A hollow east-iron armature-core composed of the annular parts A A,hollowed at their meeting sides and having the polar extensions A,sudJstantially as shown and described.

7. A hollow east-iron armature-core composed of the annular parts A A,hollowed at their meeting sides and having the hollow polar extensionsA, substantially as shown and described.

8. A hollow cast-iron armature-eore composed of the annular parts A A,hollowed at their meeting sides and having the polar extensions A, saidparts A A being divided transversely into segments, substantially as andfor the purposes herein set forth.

9. A hollow cast-iron armature-core composed of the annular parts A A,hollowed at their meeting sides and having the polar eX- tensions A,said parts A A being divided transversely through the middle of saidpolar extensions, substantially as shown and described.

In testimony whereof I at'fix my signature in presence of two witnesses.

XVARREN S. BELDIXG.

TVitnesses:

CHARLES H. ROBERTS, CYRUS KEHR.

